Warming benefits a native species competing with an invasive congener in the presence of a biocontrol beetle
Warming benefits a native species competing with an invasive congener in the presence of a biocontrol beetle
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变暖有利于本地物种在生物防治甲虫存在的情况下与入侵同类物种竞争
DOI：
10.1111/nph.13976
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发表时间：
2016-09-01
期刊：
影响因子：
9.4
通讯作者：
Ding, Jianqing
中科院分区：
文献类型：
--
作者：
Lu, Xinmin;Siemann, Evan;Ding, Jianqing
气候变暖可能通过改变本地和非本地物种之间的竞争来影响生物入侵，但这些影响可能取决于生物相互作用。在中国沿着纬度和温度梯度从21 ° N到30.5 ° N的33个地点的实地调查和在30.5 ° N的2年田间试验中，我们测试了生物防治甲虫Agasicles hygrophila在介导入侵植物空心莲子草和本地植物无柄莲子草之间竞争的变暖效应中的作用。在调查中，本地种群常年低于25.8度N，但只有一年生种群被发现高于26.5度N的入侵者占主导地位的社会。甲虫遍布整个梯度。实验性变暖（+1.8摄氏度）直接通过将其生命周期从一年生植物转变为多年生植物来提高本地植物的性能，间接地通过不成比例地增加入侵者的食草动物来释放本地植物的竞争。因此，变暖使植物群落从入侵者占主导地位转变为本地人占主导地位，但只有在甲虫存在的情况下。我们的研究结果表明，食草动物可以发挥关键作用，在确定变暖对植物群落和物种入侵的影响。了解生物相互作用如何塑造社区对气候变化的反应对于预测植物入侵的风险至关重要。
Climate warming may affect biological invasions by altering competition between native and non-native species, but these effects may depend on biotic interactions. In field surveys at 33 sites in China along a latitudinal and temperature gradient from 21 degrees N to 30.5 degrees N and a 2-yr field experiment at 30.5 degrees N, we tested the role of the biocontrol beetle Agasicles hygrophila in mediating warming effects on competition between the invasive plant Alternanthera philoxeroides and the native plant Alternanthera sessilis. In surveys, native populations were perennial below 25.8 degrees N but only annual populations were found above 26.5 degrees N where the invader dominated the community. Beetles were present throughout the gradient. Experimental warming (+1.8 degrees C) increased native plant performance directly by shifting its lifecycle from annual to perennial, and indirectly by releasing the native from competition via disproportionate increases in herbivory on the invader. Consequently, warming shifted the plant community from invader-dominated to native-dominated but only in the presence of the beetle. Our results show that herbivores can play a critical role in determining warming effects on plant communities and species invasions. Understanding how biotic interactions shape responses of communities to climate change is crucial for predicting the risk of plant invasions.